I’ve never used an API in conjunction with web services before and I’m having trouble parsing the JSON data I’m receiving from Flickr’s API. The only thing I do know (from all the things I have read) is that it is easy and very simple. About as far as I can get is returning a string in the console. Using a dictionary returns null and or an error. What am I missing? I want to be able to pull out the id and owner so that I can get the photo url.

This returns data on my photo:

NSString *json = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@”%@”, json); //this returns data on my photo

This returns null(resultDict) and error 3840:

NSString *requestString = @”https://api.flickr.com/services/rest?&method=......etc;
NSURL *url = [NSURL URLWithString:requestString];
NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:config];

NSURLSessionDataTask *task = [session dataTaskWithURL:url
  completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    NSMutableDictionary *resultdict = [NSJSONSerialization JSONObjectWithData:data        options:NSJSONReadingMutableContainers error:&error];
    NSLog(@”%@”, resultDict); //returns null
    If (error != nil) { NSLog(@”%@”, [error localizedDescription]); }
    else { self.myDict = [[resultDict objectforKey:@”photos”] objectAtIndex:0];
    NSLog(@”%@”, self.myDict); }
}];
[task resume];

To check if I have an array of dictionaries I did the following and it returned 0:

NSMutableArray *resultArray = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainer  error:&error];                                                                                                                                                                                                                          error:&error];

NSLog(@"%lu", (unsigned long)resultArray.count);

Are you sure that

[NSJSONSerialization JSONObjectWithData:data        options:NSJSONReadingMutableContainers error:&error];

returns a Dictionary and not an Array of Dictionnaries?

EDIT :

Can you try to use this to request the API please? I checked in my projects, my reponses seems to have the same syntax as yours. Only the code I use is different. (If you could give us the full URL you've to call, it would be easier for us ^^')

NSString *[email protected]"YOUR URL";
NSURL *url=[NSURL URLWithString:str];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:5.0];
NSData *returnData = [NSURLConnection sendSynchronousRequest: request returningResponse:&response error: &error];
NSMutableDictionary* resultList = [NSJSONSerialization JSONObjectWithData:returnData options:NSJSONReadingMutableContainers error:nil];

I copied it without the errors. I let you manage that ^^

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